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JEE Main & Advanced Mathematics Applications of Derivatives Question Bank Application in Mechanics and Rate Measurer

  • question_answer
    A particle is moving in a straight line according to the formula \[s={{t}^{2}}+8t+12.\]If s be measured in metre and t be measured in second, then the average velocity of the particle in third second is                

    A)            \[14\,m/\sec \]

    B)            \[13\,m/\sec \]

    C)            \[15\,m/\sec \]

    D)            None of these

    Correct Answer: B

    Solution :

               Average velocity in third second = Distance travelled in third second.                    = Distance travelled in 3 sec ? Distance travelled in 2 sec.                    \[=(9+24+12)-(4+16+12)=45-32=13\].


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